I agree with most of the comments above. Overall nice build choices. I wouldn't buy the 965, since the 955 is usually a decent amount cheaper and can easily OC to the same speeds. Stock vs stock the 750 will be around the same as 955/965 (depends on which site and which tests you look at), though there are a lot of die-hard fans that will definitely say go for the 750. I say if you have the extra few dollars in your budget (for the 750 and motherboard) and are going to do some good overclocking, then go for the 750. If you need to keep costs a bit lower and want a dead simple OC option then go for the 955.